Why do reactivity test in unsaturated polyester resin?

Reactivity tests in unsaturated polyester resin are conducted to evaluate the resin's curing behavior, stability, and performance under different conditions. These tests help determine the optimal conditions for polymerization, including temperature and catalyst concentration, ensuring effective cross-linking and final material properties. Additionally, they assess the resin's compatibility with various fillers and additives, which is crucial for achieving desired mechanical and thermal characteristics in the final product. Understanding reactivity also aids in predicting the shelf life and processing conditions necessary for the resin's application.